| Triple Ace Limited | Construction | 2011 |
| Triple J Consultancy Ltd | Health & social care | 2023 |
| Triple J Golf Limited | Wholesale & retail | 2020 |
| Tripod Construction Ltd | Construction | 2010 |
| Tripple R Projects Ltd | Administrative & support | 2023 |
| Tris&Kris Ltd | Transport & logistics | 2022 |
| Trish Global Company Limited | Agriculture & fishing | 2026 |
| Triskele Effects Limited | Information & communication | 2024 |
| Triskelsoft Ltd | Information & communication | 2004 |
| Tristan HCW Ltd | Extraterritorial | 2014 |
| Tristan Specialist Doors Ltd | Construction | 2014 |
| Tristar Global Electrical Limited | Construction | 2018 |
| TRM Homes Ltd | Real estate | 2021 |
| Trocadero Ltd | Construction | 2020 |
| Trrbo Ltd | Wholesale & retail | 2024 |
| TRU Passion Music Ltd | Education | 2018 |
| True Ananda Limited | Health & social care | 2023 |
| True Build Group Ltd | Construction | 2024 |
| True Guide Consulting Limited | Information & communication | 2025 |
| True Q Ltd | Professional & scientific | 2009 |
| True Ways Medics Limited | Health & social care | 2023 |
| Truestone Properties Limited | Real estate | 2025 |
| Truetech Integrated Ltd | Administrative & support | 2015 |
| Trufire Protection Ltd | Construction | 2023 |
| Truly Scrumptious Enterprises Ltd | Hospitality | 2018 |
| Truscott Developments Limited | Real estate | 2019 |
| Trusted Landscaper Limited | Administrative & support | 2025 |
| Trustees&Attorneys&Law Services Limited | Professional & scientific | 2023 |
| Truyen Ngoc Ltd | Other services | 2025 |
| TSA Alarms Limited | Administrative & support | 2023 |
| Tsanka Ltd | Real estate | 2022 |
| Tsavo East Ltd | Real estate | 2022 |
| Tsglazing Limited | Construction | 2020 |
| Tsheli Lujabe Consulting Ltd | Professional & scientific | 2022 |
| Tsitsi G Solutions Limited | Professional & scientific | 2015 |
| Tsori Gilead Limited | Real estate | 2005 |
| TSP Homes Ltd | Real estate | 2020 |
| TSP Partners Ltd | Professional & scientific | 2020 |
| Tsquare Properties Limited | Real estate | 2018 |
| TSR1 Associates Limited | Professional & scientific | 2025 |
| TSS Mechanical Ltd | Construction | 2025 |
| Tsteelewaterservices Ltd | Construction | 2026 |
| TT Community Support CIC | Hospitality | 2024 |
| TT Contracts Limited | Construction | 2007 |
| TTI Consultancy Ltd | Professional & scientific | 2024 |
| Ttkh Holdings Ltd | Financial services | 2024 |
| TTR Therapies Ltd | Health & social care | 2022 |
| TTS Advisory Ltd | Professional & scientific | 2020 |
| TTS Automotive Limited | Wholesale & retail | 2024 |
| TTS Automotive Specialists LLP | | 2021 |
| TTS Consultancy Ltd | Professional & scientific | 2025 |
| TTS Innovations LLP | | 2025 |
| TTS Projects Ltd | Professional & scientific | 2025 |
| TTT Empathy Care Limited | Extraterritorial | 2025 |
| TUB and Timber Co. Ltd | Wholesale & retail | 2023 |
| Tube Gear Limited | Wholesale & retail | 1982 |
| Tubular Erectors Design & Build Limited | Real estate | 1989 |
| Tuchwood Trading Limited | Information & communication | 1993 |
| Tucker Myers Properties Limited | Real estate | 2017 |
| Tudor Court (Kings Road) Management Company Limited | Other services | 2007 |
| Tuff 2 Talk Community Interest Company | Other services | 2023 |
| TUITION4ALL Ltd | Education | 2020 |
| Tumble Turf Developments Ltd | Construction | 2023 |
| Tumble Turf Ltd | Hospitality | 2023 |
| Turbo Trail Logistics Ltd | Transport & logistics | 2025 |
| Turbodyne Systems Ltd | Information & communication | 2025 |
| Turbrew Ltd | Wholesale & retail | 2025 |
| Turing Complete Solutions Ltd | Agriculture & fishing | 2010 |
| Turkish Grill Bedford Ltd | Hospitality | 2024 |
| Turkishs Barber Ltd | Other services | 2025 |
| Turn by Turn Ltd | Professional & scientific | 2016 |
| Turna Property Holding Ltd | Real estate | 2019 |
| Turnbull Occupational Therapy Services Limited | Health & social care | 2016 |
| Turner Butler Business Sales Limited | Other services | 2022 |
| Turnkey Fibre Solutions Ltd | Wholesale & retail | 2003 |
| Turtley Creative Ltd. | Arts & recreation | 2021 |
| Turvey Butchers Ltd | Manufacturing | 2025 |
| Turvey Motors Limited | Wholesale & retail | 2005 |
| Turvey Trust Company NO 1 Limited | Professional & scientific | 2024 |
| Turvey Trust Company NO 2 Limited | Professional & scientific | 2024 |
| Tutor Train Ltd | Education | 2023 |
| Tutorvine Ltd | Education | 2026 |
| Tuttlebee Studio Limited | Professional & scientific | 2016 |
| TVE Life Limited | Other services | 2026 |
| TW@ Locks Ltd | Manufacturing | 2025 |
| Twelve Acre Ltd | Administrative & support | 2023 |
| Twenty Four Seven Operator Services Ltd | Construction | 2015 |
| TWF Fleet Care Ltd | Wholesale & retail | 2021 |
| Twib Property Management Limited | Real estate | 2023 |
| Twiflex Limited | Manufacturing | 1946 |
| Twilights Counselling and Therapy Services Ltd | Health & social care | 2021 |
| Twin Otter Ltd | Administrative & support | 2024 |
| Twin Trees Limited | Arts & recreation | 1999 |
| Twinwood Festival Limited | Arts & recreation | 2025 |
| Two Hours to Paris Limited | Financial services | 2012 |
| Two Peas in a POD Boutique Ltd | Wholesale & retail | 2022 |
| Two Petals Limited | Manufacturing | 2023 |
| Two Shots Coffee Ltd | Hospitality | 2023 |
| Two-D Photography Ltd | Professional & scientific | 2010 |
| Twoeternities Ltd | Professional & scientific | 2025 |